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Other Commitments and Contingencies (Details Textual) (USD $)
 6 Months Ended
Jun. 30, 2012
Pipeline
Dec. 31, 2011
Other Commitments and Contingencies (Additional Textual) [Abstract]    
Aggregate litigation expense legal cost $ 978,000  
Litigation expense 440,000  
Contract expiration date of natural gas transportation and storage Mar. 31, 2013  
Contracts expiration related to natural gas purchase 2013-05  
Total liabilities to tangible net worth minimum times 3.75  
Fixed charge coverage ratio minimum times 1.5  
Time to cure ratio 30 days  
Funds from operations interest coverage ratio minimum times 2  
Total debt to capital maximum 0.65  
Maximum authorized liability under such guarantees and letters of credit 45,000,000  
Aggregate guaranteed amount 27,700,000  
Guarantees expiring date through June 2013  
Renewed letter of credit amount to our former primary insurance company 725,000  
Expiry date of renewed letter of credit to our former primary insurance company Jun. 01, 2013  
Drawn amount on all letter of credit 0  
Transportation service contract provided for a term of number of years 15 years  
Number of interstate upstream pipelines 3  
Accruals related to additional sales taxes and gross receipts taxes 173,000 307,000
Estimation of proportionate share pre service cost 25,500,000  
Delaware Division [Member]
    
Other Commitments and Contingencies (Textual) [Abstract]    
Additional volume subscribed 34,100  
Maryland Division [Member]
    
Other Commitments and Contingencies (Textual) [Abstract]    
Additional volume subscribed 15,900  
Letter of Credit One [Member]
    
Other Commitments and Contingencies (Textual) [Abstract]    
Letter of credit amount 1,000,000  
Issued letter of credit expiry date Sep. 12, 2012  
Letter of Credit Two [Member]
    
Other Commitments and Contingencies (Textual) [Abstract]    
Issued letter of credit expiry date Dec. 02, 2012  
Amount of letter of credit to our current primary insurance company 656,000  
TETLP [Member]
    
Other Commitments and Contingencies (Textual) [Abstract]    
Provided a letter of credit amount to TETLP related to the Precedent Agreement with TETLP 2,500,000  
Expected TETLP's mainline system expansion 190,000  
Number of transportation service contract 2  
Proportionate share of TETLP's pre-service costs 25,500,000  
Proportionate share of TETLPs pre-service costs after TETLP completed its construction of all facilities $ 50,000,000